This is a tough one because it's very specific to where you live. I'm not sure what the hazards are for you on the road. I think mostly, in addition to what has been said, it's important in all situations to be aware of other traffic. It sounds like that is mostly car traffic, but if you are in town, you need to be aware of foot traffic and other non-motorized vehicles. If you are more suburban or rural, figure out when it's safe to ride in full tuck (less visibility) and when to sit up high and get seen. Know how to occupy a lane to make a turn or other traffic move. Make eye contact with drivers when interacting in traffic... and be hesitant to make a bold move unless you have done so. Always use hand signals to show what you intend to do, and at busy intersections, even indicate "I'm going straight". I ride country roads (from my door - I was a serious cyclist when I bought and being able to ride from my door was #1 on the location aspect) and my riding in a lot of traffic is quite relative, but these are some things I think about each time. HTH!